Telephone dial illumination



19, 1940- c. J. CAROSELLI ETAL 2,222,

TELEPHONE DIAL ILLUMINATION Filed March 4-, 1-940 2 Sheets-Sheet 1 JNVE/VTOPJ, alarence J ara.se//, Allen 1 San/er;

.47 TOP xv: x5

Nov. 19, 1940. c. J. CAROSELLI ETAL 2222,

mmrnonn DIAL ILLUMINATION Filed March 4', 1940 2 Sheets-Sheet 2 7 TOP/VEVJ Patented Nov. 19, 1940 UNITED STATES 2,222,476 TELEPHONE DIAL ILLUMINATION Clarence J. Caroselli and Allen V. Sanders, In-

dianapolis, Ind., assignors of one-third to Amil CarosellL, Indiana 1 Ind.

Application M h 4, 1910, Serial No. 322,088

2 Claims.

This invention relates to a dial signaling type telephone and particularly to means for illuminating the dial. A primary object of the invention is to provide means for automatically illuminating the dial of the telephone at all times when the receiver may be removed in such manner that the primary telephone circuit to the line is connected by .that receiver in the usual manner. A further object of the invention is-to provide means automatically giving a visual signal to indicate the fact that the circuit has not been interrupted by improper replacement of the receiver which may happen particularly in the hand set type of telephones now commonly being used.

In describing one particular form of the invention, reference is made to the accompanying drawings, in which Fig. 1 is a top plan view of a structure embodying the invention;

Fig. 2, a side elevation in partial section;

Fig, 3, a transverse section on the line 3-3 in Fig. 2; and

Fig, 4, a wiring diagram.

Like characters of reference indicate like parts throughout the several views in the drawings.

In the particular form of the invention herein shown, a telephone hand set comprises essentially the base member In and the receiver transmitter unit II that is normally positioned between the cradle fingers l2 and I3 to carry the unit hereinafter termed the receiver, transversely across the base in that cradle to have the receiver r I L, by its own weight, pressed downwardly on the pair of push buttons l4 and I5 normally extending upwardly between the set of fingers I2 and I3, all in the usual manner. As indicated in Fig. 3, these buttons l4 and I5 rest by their lower ends against a switch rocker bar l6 that is pivoted by arms to the shaft IT.

The bar I6 carries a button l8 that is mounted to be in the path of\ a switch finger l9 which in turn is in the path pf a button 20 on a second switch finger 2|, these two fingers l9 and 2| controlling the telephone circuits in the usual manner.

Now in addition to those usual switch mem hers is added a third switch finger 22 that carries a push button 23 thereon spaced normally a distance beyond the last standard finger 2|. This spacing is essential in that it is desired that the finger 22 be not shifted until after the fingers l9 and 2| have been moved to open their respective circuits in the usual manner.

As indicated in Fig. 3, the added switch finger 22 is normally in contact with a switch tongue 24 to which the wire 25 is connected. This wire 25 leads from the telephone base ID to any suitable source of current independently of the tele- 5 phone circuit supply current. In the form herein shown, it is shown as leading through the cable 26 to a transformer 21 that is supplied with current through the cable 28 from the usual power line carrying current for illumination purposes 10 face on which the numbers or call characters are 20 placed. As indicated, these lamps are within the housing of the base ID to be fully protected thereby. Furthermore the lamps are so mounted as to prevent any interference thereby with the operation of the usual dialing mechanism in 25 the telephone.

A wire 33 isconnected with the added switch finger 22 and is interconnected in the circuit of the lamps 29 and 30 and carried out through the cable 26 to the transformer 21 to complete 30 the circuit as indicated in Fig. 4. Thus it is to be seen that whenever the buttons l4 and I5 are pushed downwardly to open the circuits controlled by the switch fingers I9 and 2|, the switch finger 22 will be pushed to its open position to interrupt the circuit through the lamps 29 and 30 and conversely when the receiver II is lifted from its cradle and the buttons I4 and I5 allowed to lift in the usual manner as controlled by the usual spring 34, the fingers 'l9 and 2| move to their usual closed circuit positions and so does the finger 22 to cause illumination of the lamps 29 and 30.

The lamps 29 and 39 will, therefore, remain illuminated until the buttons l4 and [5 are fully depressed to break the telephone circuits, a condition which occurs only when the receiver II is properly placed back on its cradle. It is frequently the case that the receiver II will be 50 station to call that telephone. Any glance topositioned.

While we have herein shown and described our invention in the one particular form, it is obvious that structural variations may be employed without departing from the spirit of the invention and we, therefore, do not desire to be limited to that precise form beyond the limitations as may be imposed by the following claims.

We claim: A

1. In a telephone hand set having a relatively fixed signaling dial carrying indicia, a revolvable dial s'paced above the fixed dial, said revolvable dial having a plurality of openings through which said indicia may be observed, a cradle to receive the receiver, a push button in the cradle normally depressed by the receiver when properly placed in the cradle, and telephone circuit control switch means opened by depression of the button, the combination of a lamp carried by said set and positioned at a level between both of said dials to illuminate the fixed dial, a switch, a circuit independent of the telephone circuit to supply power to said lamp through said switch, and actuating means between said switch and said button arranged to open the switch upon depression of the button to the full rest position of the receiver in said cradle.

2. In a telephone hand set having a relatively fixed signaling dial carrying indicia, a revolvable dial spaced above the fixed dial, said revolvable dial. having a plurality of openings through which said indicia may be observed, a cradle. to receive the receiver, a push button in the cradle normally depressed by the receiver when properly placed in the cradle, and telephone circuit control switch means opened by depression of the button, the combination of a lamp carried by said set and positioned at a level between both of said dials to illuminate the fixed dial, a switch, a circuit independent of the telephone circuit to supply power to said lamp through said switch, and actuating means between said switch and said button arranged to open the switch upon depression of the button to the full rest position of the receiver in said cradle, said fixed dial being mounted below the face of said hand set to position said revolvable dial substantially at the face level of said set, and said lamp being within said set, whereby all of the illumination visible from said lamp from the interior of said set is that through the openings in said revolvable dial.

CLARENCE J. CAROSELLI. ALLEN V. SANDERS. 

